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Related Experiment Videos

Multidrug resistance in pediatric malignancies

H S Chan1, G DeBoer, G Haddad

  • 1University of Toronto, Ontario, Canada.

Hematology/Oncology Clinics of North America
|April 1, 1995
PubMed
Summary

P-glycoprotein (P-gp) contributes to multidrug resistance in cancer. This review examines tools and evidence for P-gp

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Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • P-glycoprotein (P-gp) is implicated in multidrug resistance (MDR) in cancer cell lines.
  • Its clinical relevance in patient chemoresistance is under investigation.
  • Assessing P-gp expression requires robust immunohistochemical and molecular tools.

Purpose of the Study:

  • To review tools for assessing P-glycoprotein expression in patient samples.
  • To evaluate methodological issues in clinical studies of P-gp.
  • To review evidence supporting P-gp's role in limiting cancer chemotherapy efficacy.

Main Methods:

  • Review of existing literature on P-glycoprotein expression and clinical outcomes.
  • Analysis of immunohistochemical and molecular biologic techniques for P-gp detection.
  • Examination of malignancies where P-gp substrates are used and therapy fails.

Main Results:

  • Studies in adult acute myelogenous leukemia, lymphoma, myeloma, and pediatric neuroblastoma, rhabdomyosarcoma, and acute lymphoblastic leukemia show strong associations between P-gp expression and poor treatment outcomes.
  • Differences in detection techniques and study designs may explain some controversies.
  • Early identification of patients with low P-gp expression is crucial for potential benefits from MDR reversal therapies.

Conclusions:

  • Clinical relevance of P-glycoprotein in multidrug resistance is supported by evidence in various hematologic and pediatric malignancies.
  • Methodological standardization is key to resolving discrepancies in study findings.
  • Future clinical trials investigating chemosensitizers aim to confirm P-gp's role and improve chemotherapy outcomes.

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